Maybe some new meds might help, but I doubt things will get easier the older she gets, and it looks like this is having some detrimental effect on your mental health. In your heart I think you already know what you want and need for a peaceful, healthy good life. IMHO, life is too short for this kind of stress and drama. It’s corrosive and damaging.
You have a lot of yesterdays behind you and fewer tomorrows, but you’re still young enough to enjoy your life. Don’t waste it.